package main

import (
	"fmt"
	"time"
)

func main() {
	now := time.Now()
	fmt.Printf("毫秒: %s\n", now.Format("2006-01-02 15:04:05.000"))
	fmt.Printf("微秒: %s\n", now.Format("2006-01-02 15:04:05.000000"))
	fmt.Printf("纳秒: %s\n", now.Format("2006-01-02 15:04:05.000000000"))
}